<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      var sum = 0;
      for (var i = 1; i <= 5; i++) {
        var score = +prompt(`请输入第${i}个同学的成绩`);
        sum += score;
      }
      var avarge = sum / 5;
      console.log(sum);
      console.log(avarge);
    </script>
  </body>
</html>
